You too shall give: Not only will our livestock go with us, but you too shall give [of your livestock or something else to sacrifice].

גם אתה תתן: לא דייך שמקננו ילך עמנו, אלא גם משלך תתן:

26And also our cattle will go with us; not a [single] hoof will remain, for we will take from it to worship the Lord our God, and we do not know how [much] we will worship the Lord until we arrive there."

Please, speak-: Heb. דַבֶּר-נָא is only an expression of request. [The verse is saying] I ask you to warn them about this, [i.e., to ask their neighbors for vessels] so that the righteous man, Abraham, will not say He fulfilled with them [His promise] “and they will enslave them and oppress them” (Gen. 15:13), but He did not fulfill with them “afterwards they will go forth with great possessions” (Gen. 15:14). — [from Ber. 9a]